Issue link: http://winesandvines.uberflip.com/i/279499
p r a c t i c a l w i n e r y & v i n e ya r d a p r i l 2 0 1 4 63 g r a p e g r o w i n g spores are lifted into the air mass above the canopy (Figure 3). The turbulence is also likely to impact the spread of some insects and the disease they spread (such as mealybugs). Pathogen infection, growth and sporu- lation are also governed by the microcli- mate created by all the above interacting factors and local weather patterns. While this complexity would seem to indicate that one cannot rely on the trap results, we have found that strategically target- ing trap placement can still yield action- able information. In the early spring, when ascospore release is the most likely inoculum source, the vineyard area represented by a trap is not really a concern for most vineyards. Traps should be placed in regions of the vineyard that were highly diseased in the previous year (look for cane scaring clos- est to the spur or head) or placed in a vineyard with a history of disease show- ing up at the beginning of each new growing season. We found that these locations had the greatest probability of high levels of overwintering inoculum For Powdery Mildew and Mite control, grape growers have a choice: JMS Stylet-Oil JMS oers grape growers an eective alternative to early-season sulfur treatment. • Outperforms sulfur as an eradicant on powdery mildew - University researched and rated 10/10. • JMS Stylet-Oil is a stand-alone product for powdery mildew. • Eliminates early season inoculum growth that can cause late-season epidemics. • Unlike sulfur, JMS Stylet-Oil works well in cool weather, protects around the clock, and harmlessly degrades without potential air pollution. Apply this clean white oil early for mite control throughout the season. JMS Stylet-Oil is now available in its conven- tional formulation or an organic formula- tion that is OMRI listed for use in an organic program. Contact JMS for complete information and product data. • Powdery Mildew? • Mites? Headquarters 4423 5th Place SW Vero Beach, FL 32968 Office: (772) 562-8770 Fax: (772) 562-7202 styletoil@aol.com www.stylet-oil.com Pacific Northwest Region 73585 Williams Lane Pendleton, OR 97801 Office: (541) 276-8566 Fax: (541) 276-6245 styletoil@eoni.com JMS Stylet-Oil ® - e Choice C M Y CM MY CY CMY K JMS4.75X92011 copy.pdf 1 10/20/11 2:07 PM Powdery mildew infection of clusters often radiates from infections that occur on the inner portion of the clusters. Severe powdery mildew infection of the cluster without the gray scarring seen later in the season. Diffuse infections of berries are not visible until the gray scarring appears well after infection. Photo BY WAlt mAhAffee Photo BY WAlt mAhAffee Photo BY WAlt mAhAffee